FlexRay

An independent, clean-room FlexRay static-segment node — written from the public ISO 17458 frame/CRC semantics, not from the catalog’s own flexray FSM — that configures a real multi-slot TDMA schedule over APB, decodes the DUT’s own transmissions off the wire with an independently recomputed header-CRC-11 and frame-CRC-24, and injects frames into the DUT’s receive path over a genuinely separate RX wire. Covers the static segment only (FlexRay’s core deterministic scheduling mechanism); the dynamic (minislotting), symbol-window, and NIT segments are counted-but-unstructured place-holders in this RTL and are out of scope. Single active channel per interop scenario against an 8-byte tractable payload subset (matching the DUT’s PAYLOAD_MAX default), with a directed characterization proving the DUT’s two channels mirror identical TX content and are not independently operable. This second-source effort also surfaced a real RTL finding, fixed 2026-07-09: the DUT’s protocol-fault path checked only header-CRC on receive, not frame-CRC — a frame with a good header but corrupted frame CRC was silently buffered without ever raising a safety fault (correctly flagged in the RX metadata, but not escalated). Fixed by recomputing the frame-CRC-ok expression fresh in the fault check rather than reading the register the DUT updates the same cycle; the VIP’s own interop TB now proves the fault correctly fires (err_code 3).

Key Features

• Independent bit-serial header/trailer decode with recomputed CRC-11 (header) and CRC-24 (frame), cross-checked against the DUT’s own APB-exposed RX metadata
• Slot-timing-aware frame injection synchronized to the DUT’s own transmit window, proving real (non-loopback) receive-and-buffer behavior across a 2-slot TDMA schedule
• Passive protocol checker: header/frame-CRC legality, reserved-field and payload-length framing checks, frame-ID schedule-membership, and slot-boundary gap legality, each proven by a directed error injection
• Channel A/B characterization test against the real DUT, documenting that TX content is mirrored across channels and RX is channel-A-priority; a real frame-CRC-fault-not-escalated finding was also surfaced and fixed (safety fault now correctly raised, err_code 3)

Standards & Compliance

ISO 17458 (FlexRay Communications System)

Pairs With

Built to lean against these catalog IPs during integration:

• flexray